Ellipticity of the polarization ellipse of the reflected wave (vertical axes) as a function of the incident angle θi (horizontal axes). For Case (a), ∊1 = 9∊0, ∊ = ∊0; for Case (b), ∊1 = ∊0, ∊ = 9∊0. The values of γ are shown on each plot. For both cases it is assumed that μ1 = μ = μ0.